package com.dong.shortlink.admin.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.lang.UUID;
import com.alibaba.fastjson2.JSON;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.dong.shortlink.admin.common.convention.exception.ClientException;
import com.dong.shortlink.admin.common.enums.UserErrorCodeEnum;
import com.dong.shortlink.admin.dao.entity.UserDO;
import com.dong.shortlink.admin.dao.mapper.UserMapper;
import com.dong.shortlink.admin.dto.req.UserLoginReqDTO;
import com.dong.shortlink.admin.dto.req.UserRegisterReqDTO;
import com.dong.shortlink.admin.dto.req.UserUpdateReqDTO;
import com.dong.shortlink.admin.dto.resp.UserLoginRespDTO;
import com.dong.shortlink.admin.dto.resp.UserRespDTO;
import com.dong.shortlink.admin.service.UserService;
import lombok.RequiredArgsConstructor;
import org.redisson.api.RBloomFilter;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

import static com.dong.shortlink.admin.common.constant.RedisCacheConstant.LOCK_USER_REGISTER_KEY;
import static com.dong.shortlink.admin.common.enums.UserErrorCodeEnum.USER_NAME_EXIST;
import static com.dong.shortlink.admin.common.enums.UserErrorCodeEnum.USER_SAVE_ERROR;

/* 用户接口实现层*/
@Service
@RequiredArgsConstructor
public class UserServiceImpl extends ServiceImpl<UserMapper, UserDO> implements UserService {

    private final RBloomFilter<String> userRegisterCachePenetrationBloomFilter;
    private final RedissonClient redissonClient;
    private final StringRedisTemplate stringRedisTemplate;
    @Override
    public UserRespDTO getUserByUsername(String username) {
        LambdaQueryWrapper<UserDO>queryWrapper=Wrappers.lambdaQuery(UserDO.class)
                .eq(UserDO::getUsername,username);
        UserDO userDO = baseMapper.selectOne(queryWrapper);
        if(userDO == null){
            throw new ClientException(UserErrorCodeEnum.USER_NULL);
        }


        UserRespDTO result = new UserRespDTO();
        BeanUtils.copyProperties(userDO,result);
        return result;
    }

    @Override
    public Boolean hasUsername(String username){
        return !userRegisterCachePenetrationBloomFilter.contains(username);
    }
    @Override
    public void register(UserRegisterReqDTO requestParam){
        if(!hasUsername(requestParam.getUsername())){
            throw new ClientException(USER_NAME_EXIST);
        }
        RLock lock = redissonClient.getLock(LOCK_USER_REGISTER_KEY+requestParam.getUsername());
        try{
            if(lock.tryLock()){
                int inserted = baseMapper.insert(BeanUtil.toBean(requestParam,UserDO.class));
                if(inserted< 1){
                    throw new ClientException(USER_SAVE_ERROR);
                }
                userRegisterCachePenetrationBloomFilter.add(requestParam.getUsername());
                return;
            }
            throw new ClientException(USER_NAME_EXIST);
        }finally {
            lock.unlock();
        }
    }

    @Override
    public void update(UserUpdateReqDTO requestParam){
        //TODO验证当前用户是否为登录用户
        LambdaUpdateWrapper<UserDO> updateWrapper = Wrappers.lambdaUpdate(UserDO.class)
                .eq(UserDO::getUsername,requestParam.getUsername());
        baseMapper.update(BeanUtil.toBean(requestParam,UserDO.class),updateWrapper);
    }

    @Override
    public UserLoginRespDTO login(UserLoginReqDTO requestParam){
        LambdaQueryWrapper<UserDO> queryWrapper = Wrappers.lambdaQuery(UserDO.class)
                .eq(UserDO::getUsername,requestParam.getUsername())
                .eq(UserDO::getPassword,requestParam.getPassword())
                .eq(UserDO::getDelFlag,0);
        UserDO userDO = baseMapper.selectOne(queryWrapper);
        if(userDO == null){
            throw new ClientException("用户不存在");
        }
        Boolean hasLogin = stringRedisTemplate.hasKey("login_"+requestParam.getUsername());
        if(hasLogin != null && hasLogin){
            throw new ClientException("用户已登录");
        }
        /**
         * Hash
         * Key：login_用户名
         * Value：
         *  Key：token标识
         *  Val：JSON 字符串（用户信息）
         */
        String uuid = UUID.randomUUID().toString();
        stringRedisTemplate.opsForHash().put("login_"+requestParam.getUsername(),uuid, JSON.toJSONString(userDO));
        stringRedisTemplate.expire("login_"+requestParam.getUsername(),30L,TimeUnit.MINUTES);
        return new UserLoginRespDTO(uuid);
    }

    @Override
    public Boolean checkLogin(String username,String token){
        return stringRedisTemplate.opsForHash().get("login_"+username,token)!= null;
    }
    @Override
    public void logout(String username,String token){
        if(checkLogin(username,token)){
            stringRedisTemplate.delete("login_"+username);
            return ;
        }
        throw new ClientException("用户token不存在或用户未登录");
    }
}
